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Effects of Mechanical Stimulation and Chemical Treatments on Growth of Seedlings and Yield of Tomato (토마토 육묘 시 물리적 자극 및 약제 처리가 묘의 소질과 수량에 미치는 영향)

  • Choi, Young Hah;Rhee, Han Cheol;Park, Dong Kum;Kwon, Joon Kook;Lee, Jae Han
    • Horticultural Science & Technology
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    • v.19 no.3
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    • pp.320-324
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    • 2001

  • This study was conducted to investigate the effects of mechanical stimulation and growth regulators known to control overgrowth in hot temperature tomato transplants on the seedling quality and the growth and yield after planting. Brushing and impedance were applied as mechanical stimulation, and diniconazole and hexaconazole as chemical growth regulator were used in various ways at different concentrations and treatment times. Diniconazole treatment regardless of concentration and treatment times reduced plant height, leaf area and fresh weight of young plant. Though treatments of high concentration and many times reduced the yield of tomato after planting, these of proper amount and proper times maintained the level of control. Hexaconazole treatment controlled less plant height of transplants than diniconazole, and its effect also didn't support continuously after planting. However, hexaconazole treatment reduced the yield due to little fruit number and malformed plants, and also delayed the harvesting time as compared to the control. Both brushing and impedance controlled plant height of transplants. However, impedance treatment reduced the yield due to malformed plants after planting, and also delayed the harvesting time, while brushing treatment didn't reduced growth and yield as compared to the control. From the above results, it was thought that proper application of brushing and diniconazole can control excessive overgrowth without reducing yield.

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Temperature Sensitivity for Flowering of Bulblets in Lilium formolongi (신나팔나리(Lilium formolongi) 인편자구의 개화를 위한 온도 감응)

  • Goo, Dae-Hoe
    • Journal of Bio-Environment Control
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    • v.17 no.3
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    • pp.221-225
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    • 2008

  • Lilium formolongi 'Fl August' plantlets with scale-leaves and scale-bulb were treated at 10, 15, 20, $25^{\circ}C$ for 15, 30, or 45 days and planted in February, March, April and May. In the April planting, flowering percentage was below 10% and in the May planting no flowering occurred. Sprouting and flowering percentages were lower at the late planting times. Days to flowering of the April planting was 110.8 days compared to 128 days for the February planting. Plant height and numbers of leaves were reduced to 7.2 in May planting, compared to 40.5 leaves in February planting, and almost no flowers emerged in either the April or May plantings. Plantlets exposed to 10 or $15^{\circ}C$ flowered at 80 percent or higher at all treatment durations, but at 20 or $25^{\circ}C$ flowering percentages were lower, with 30% or less in the $25^{\circ}C$ treatment. In the $15^{\circ}C$ treatment days to flowering were less than 100 days, while the number of flowers and flower bud differentiation were greatest in the $15^{\circ}C$ treatment. Cytokinin and auxin were analyzed in bulblets grown at 15, 20 and $25^{\circ}C$. T-zeatin content was three times greater in the $15^{\circ}C$ treatment than at $25^{\circ}C$, but the content of indoleacetic acid (IAA) was less at $15^{\circ}C$ than at 20 and $25^{\circ}C$. In the $15^{\circ}C$ treatment, T-zeatin content was about twice the IAA content in the scale- bulblet. The auxin and cytokinin balance may affect flower bud differentiation. $15^{\circ}C$ with 30 days was most effective for flowering in scale-bulblet and planting of February and March were effective for flowering too.

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한국항공우주산업(주)의 설립과정과 의의

  • 한국항공우주산업진흥협회
    • Aerospace Industry
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    • v.69
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    • pp.12-14
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    • 1999

  • 지난 10월 1일 한국항공우주산업(주)는 발기인 총회를 개최하고 상법상의 주식회사로 정식 설립되기 위한 준비에 들어갔다. 이로써 항공우주산업(주)는 자금, 시설, 인력의 효율적인 운영과 훈련기, 경전투기, 헬기 등을 자체 생산하여 2010년까지 우리나라가 세계 10위권 항공산업국으로 발돋움 하는데 큰 역할을 할 것으로 기대된다.

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A Study of Media Gateway for Non-ATM in ATM Switching system (ATM교환기에서 Non-ATM MG 연구)

  • 조광수;박태준;김도연;김정식
    • Proceedings of the IEEK Conference
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    • 2000.11a
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    • pp.295-298
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    • 2000

  • 본 논문은 ATM교환기에서 Non-ATM정합을 위한 미디어게이트웨이의 개발방안과 하드웨어, 소프트웨어 구조에 대해서 기술한다. 미디어게이트웨어의 하드웨어 구조는 ATM계층처리보드와 다중화처리보드 및 서비스보드들로 구분되며 Non-ATM을 서비스별로 처리할 수 있는 보드를 모듈당 최대 8매까지 실장 할 수 있다. 다중화처리보드는 ATM셀 MUX/DEMUX기능과 IPC송수신기능을 처리하고 서비스보드의 링크상태관리, 운용기능을 수행한다. 서비스보드의 종류는 프레임릴레이, 회선대행, AAL2 트렁킹, N-ISDN중계선 연동기능을 각각 수행한다.

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